Slideshow: Oprah's 25 greatest guests

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The final episode of The Oprah Winfrey Show is quickly approaching. Through her 25 years as a talk show host, Oprah Winfrey has shared the compelling stories the show’s guests with her millions of fans. Viewers are waiting in excitement to see who the final people to grace the show’s stage will be. Here are our picks for Oprah’s 25 best guests.